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Hair possessing average porosity allows moisture to pass into the cortex as needed, but resists permitting too much water to penetrate. Perming or coloring can be done in a predictable manner. Read more about porosity.

Low porosity is characterized by a very tightly bound cuticle layer, where the individual cuticle scales lie flat and overlap one another. Overall this type of hair is considered to be quite healthy.Read more about porosity.